media_player on/off services do not consider supported features of platform

[andrewsayre]

Home Assistant release with the issue: 0.91.0

Last working Home Assistant release (if known): None

Operating environment (Hass.io/Docker/Windows/etc.): Docker and venv

Component/platform: media_player

Description of problem:
When invoking the service media_player.turn_on and passing an entity_id: all, platforms that do not support turn_on will raise a NotImplementedError in the logs. This is also true of media_player.turn_off.

Problem-relevant configuration.yaml entries and (fill out even if it seems unimportant):

# Anywhere the service is called, such as an animation action:
  action:
  - data:
      entity_id: all
    service: media_player.turn_off

Traceback (if applicable):

Error while executing automation automation.turn_off_devices_when_no_one_is_home. Unknown error for call_service at pos 3: 
Traceback (most recent call last):
  File "/usr/src/app/homeassistant/components/automation/__init__.py", line 380, in action
    await script_obj.async_run(variables, context)
  File "/usr/src/app/homeassistant/helpers/script.py", line 131, in async_run
    await self._handle_action(action, variables, context)
  File "/usr/src/app/homeassistant/helpers/script.py", line 210, in _handle_action
    action, variables, context)
  File "/usr/src/app/homeassistant/helpers/script.py", line 299, in _async_call_service
    context=context
  File "/usr/src/app/homeassistant/helpers/service.py", line 88, in async_call_from_config
    domain, service_name, service_data, blocking=blocking, context=context)
  File "/usr/src/app/homeassistant/core.py", line 1138, in async_call
    self._execute_service(handler, service_call))
  File "/usr/src/app/homeassistant/core.py", line 1160, in _execute_service
    await handler.func(service_call)
  File "/usr/src/app/homeassistant/helpers/entity_component.py", line 188, in handle_service
    self._platforms.values(), func, call, service_name
  File "/usr/src/app/homeassistant/helpers/service.py", line 314, in entity_service_call
    future.result()  # pop exception if have
  File "/usr/src/app/homeassistant/helpers/service.py", line 328, in _handle_service_platform_call
    await getattr(entity, func)(**data)
  File "/usr/local/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/src/app/homeassistant/helpers/entity.py", line 477, in turn_off
    raise NotImplementedError()
NotImplementedError

Additional information:
Platforms of the media_player component do not have to support turn_on and turn_off as not all devices have these capabilities (i.e. Roku). Support for these services are reflected in the state attribute supported_features represented by the constants SUPPORT_TURN_ON and SUPPORT_TURN_OFF.

Services should consider supported_features and only raise NotImplementedError if support was indicated and the method was not implemented.